On 14 July 2005 10:08, Johannes Waldmann wrote:

I am writing a long string (several MByte) to a file, with writeFile fname ( render d ) where d :: Text.PrettyPrint.HughesPJ.Doc

I wonder what happens internally (when compiled with ghc -O, if that matters) Will the string be in memory completely before it is actually written?

No, it should be streamed to the output in constant space, as long as the String can be evaluated lazilly. Cheers, Simon